\etap K puzzle of B meson decays and new physics effects in the TC2 model
Abstract
Using the low energy effective Hamiltonian with the generalized factorization, we calculate the new physics contributions to B \to \pi^+ \pi^-, K \pi and K \etap in the Topcolor-assisted-Technicolor(TC2) model, and compare the results with the available data. By using F_0^{{\rm B\pi}}(0)=0.20\pm 0.04 preferred by the CLEO data of B \to \pi^+ \pi^- decay, we find that the new physics enhancements to B \to K \etap decays are significant in size, \sim 50% with respect to the standard model predictions, insensitive to the variations of input parameters and hence provide a simple and plausible new physics interpretation for the observed unexpectedly large B\to K \etap decay rates.